*{
  margin: 0;
  padding: 0;
}
a{
  text-decoration: none;
}
ul,ol{
  list-style: none;
}
table{
  border-collapse: collapse;
}
.clearfix::after{
  content:'';
  display: block;
  clear: both;
}
button,input{
  border: 0;
}

/* 兼容 */
.clearfix{
  zoom:1;
}